Boiler with interdeck superheater



April 25, 1933. H. J. KERR ET AL BOILER WITH INTERDECK SUPERHEATER Filed Nov. 24; 1928 3 Sheets-Sheet 1 flwv qwam ynons BY 6 W .4011 ATTORNEYS A ril 25, 1933. H ERR ET A 1,906,125

BOILER WITH INTERDECK SUPERHEATER Filed Nov. 24, 1928 3 Sheets-Sheet 2 9421, iNVENTOR MM 2/ April 25, 1933. H. J KERR ET AL BOILER WITH INTERDEC K SUPERHEATER 3 Sheets-Sheet 3 Filed Nov. 24. 1928 ATTORNEYS Patented Apr. 25, 1933 i UNITED STATES PATENT OFFICE HOWARD .1. m or wns'rrmm), NEW JERSEY, AND ILLIAM A. JONES, or xvi-term.-

LEIGH, NEW YORK, ABSIGNORS ro 'rnn BABCOCK a wrLcox COMPANY, or BAYONNE, NEW JERSEY,- A. CORPORATION or NEW JERSEY BOILER wrrn IN'rnnnncK surnnmwrnn Application filed November 24, 1928. Serial No. 321,863.

' This invention relates to a water tube boiler with an interdeck superheater that is sup-' ported by the boiler tubes. The invention will be understood from the description in connection with the accompanying drawings in which Fig.1 is a vertical section through an illustrative embodiment of the invention; Fig. 2 is a section on an enlarged scale showing some of the details; Fig. 3 is a section similar to F ig. 2 showing a modification; Figs. 4 and 5 are sectional views at right angles to each other on an enlarged scale show ing details of one of the supports for the superheater; Fig. 6 is a perspective view of one of the tile-and Fig. 7 is a section showing so gle of the details of the support for a boiler tu e.

In the drawings reference character 1 indicates a steam and water drum to the water space of which nipples 2 are connected and extend to the downtake headers 3, that are connected by a bank of inclined tubes 4' to the uptake headers 5 which are in turn connected by the circulating tubes 6 to the steam space of the steam and water drum 1, intermediate nipples 7 connect the headers 3 to the lower downtake headers 8 that are connected by a bank'of inclined tubes 55 headers 10,' that are in turn connected by means ofthe nipples 11 to the uptake head- A-row of tubes or pipes 12 connects the steam space of thesteam and water drum 1 to a number of points along the length of the intake header 13 of the superheater, that is located between the banks 4 and 9 of in-' clined tubes. The/pipes 12 are provided with removable sections 14 that can be taken out when it is desired to remove the tubes 4 of the boiler for replacement or repair, or for passing'an expander through the horizontal I portion 12' which enters the inlet header 13.

s of the tubes, as shown in to the lower uptake "lower row -of a superheater, each having one;

leg longer than the other and having their longer legs connected to the inlet header 13 and the shorter legs connected by electric welding to Y-connectors 16 that have shanks that may extend through holes'in metal strips for supporting the ends of the tubes. The shanks of the connectors 16 may be providedwith removable plugs in their ends for cleaning the tubes. The U-tubes 15 inthe uppermost row have" one of their legs longer than the other, and the longer legs extend into the outlet header 17 of the superheater. The longer legs of the tubes 15 that extend into the superheater headers'13 and 17 may be bent downwardly so as -t facilitate removal dotted lines.

The superheater header 17 is supported by straps 18 that are attached to the lower tubes of the bank 4 and to fins or lugs that are welded to the upper side of the superheater header. Straps 19 support the lower header 13 from the header 17, fins or lugs being weld-' ed to the superheater headers for attachment of the straps 19.

v A bafile 20 extends from the upper end of the downtake headers 8 along the upper side of the upper row of tubes 9 for some distance, and flame plates 21 and a layer oftile 22 or other refractory material extend from the end' of the baflle. 20 across the space between the banks of tubes 9 and 4 and also across the bank of tubes 4. to constitute a baflle for the gases. The flame plates 21 are made of metal and are notched or provided with holes to fit around the tubes 4, and thus'providea suspension means for one end of the superheater tubes, which suspension means is supported by the inclined tubes 4. The holes in the plates 21 through which the long legs of the tubes 15 pass to be connected to the headers 13 and 17 may be made larger than the tubes to permit longitudinal expansion of the headers 13 and 17 without straining the tubes. The Y-connectors 16 have their shanks extending through holes in the plates 21 as'most clearly indicatedin Fig. 2, and thus support the ends of the superheater-tubes 15', The Y-' connectors 16 may be kept in place in the i holes inthe plates 2'1by means of collars .16 4

welded or screwed onto the shanks of the connectors (Fig. 2). Beveled holes 21" are provided through which the long legs of the tubes 15 pass.

A pier 23, which may be connected to the upper tubes of the bank 9, is provided upon which a support intermediate the ends of the superheater rests. This support comprises metal plates 25 having holes through which the tubes pass, which metal plates 25 may be covered with refractory material 26. Inserts 23 may distribute the weight over a plurality of vertically spaced rows of the tubes 9.

A baflie 27 extends from the tubes 6 across the tubes 4 between the baflle 21 and headers 3. There is a single pass of the gases across the tubes 9 and then the gases pass a plurality of times across the tubes 4 before they pass out between the nipples 2 and through the outlet 28. The superheater'tubes shown in Fig. 1

are installed horizontally, so that the superheater can be drained.

In the modification shown in Fig. 3, the superheater tubes 15 are parallel to the tubes 4 and 9. In this modification no support is provided between the superheater inlet header 13 and the tubes 9. However, suspension members 24 are connected to the lower ends of the flame plates 21 and support the upper rows of lower tubes 9.

The support upon which the plates 25 that extend across the superheater tubes rest, is shown most clearly in Figs. 4 and 5. It comprises a row of saddles 30 with rounded portions 30 to fit upon the tubes 9. The saddles 30 are provided with upwardly extending proj ections 31 having recesses 32 to provide .notches wider than the thickness of the plates 25 in which the lower ends of the plates 25 rest and can move longitudinally of the tubes. U-bolts 24are provided for clamping the saddles 30 to the upper row of tubes 9. The curved portion of each U-bolt 24 is flattened to provide a substantial area of contact with the tube and the bolts may be provided with tits or extensions 34 to project into recesses in the tile 35.

Two rows of tile 35 are installed between the two upper rows of tubes 9. One of the tile is most clearly shown in Fig. 6 having rounded ends 36 to fit the tubes 9 and having grooves 37 for the U-bolts 24, and each one also having a groove 38 for the tits 34 on the U-bolts 24. One row of tile 35 is laid on the second row of tubes 9 with thewide faces uppermost and with the grooves 38 so that the tits 34 on the U-bolts 24 extend into the grooves 38. The other row of tile 35 is reversed, having the flat faces in contact with the flat faces of the lower row with the grooves 37 so placed that the U-bolts 24- lie in the grooves 37.

Fig. 7 shows some of the details of the way the upper rows of tubes 9 is supported from the superheater header 13. The straps 40 extend from lugs or fins 41 on the lower side of the superheater header 13 to lugs 42 near the ends of the plates 21. Lugs 43 are welded to the upper sides of the tubes 9, as shown at 43, and have extensions 44 extending over the lower end of the plates 21, so that the tubes 9 are supported through the lugs 42, 43 and bars 40 from the superheater header.

' By this invention an interdeck superheater is supported from the boiler tubes so that the superheater, its supports and the gas bafiies will rise and fall with temperature changes. The tubes of the upper bank of tubes 4 are tied together by the baffles so that they act as a unit to give strength, and the upper row of tubes of the bank 9 is supported at a point intermediate the lengths of the tubes so that the tubes will sustain the weight of the main part of the superheater tubes which will rise and fall with temperature changes as the boiler tubes do. The pipes 12 that extend from the steam and water drum 1 to the superheater header 13 are made straight where they enter the superheater header and pass a sufficient distance below the lower ends of the headers 3 so that the nipples 7 may be bent apart to permit the tubes 12 to pass through.

By this invention the superheater can be made up of sections comprising tubes and return bends that can be removed as a unit. A section can be removed, as indicated in dotted lines in Fig. 1. Since the horizontal part of the lower superheater tubes extend farther beyond the plate 21 than the hori- Zontal part of the upper superheater tubes, a section can be removed by rotating it about the point where the upper tube passes through the supporting plate until the bend in the lower leg of the superheater tube in that section is directly below the bend in the upper leg and the forward part of the superheater section is in the dotted line position, so that it is opposite the space between the uptake intermediate nipples 11. The superheater section is then drawn forward and upward and the portions of the superheater tubes which are bent downward toward the rear easily pass through the beveled holes in the plates 21. In the modification shown in Fig. 3. the sections are, of course, moved out between the nipples 11 by being drawn out in a direction parallel to the length of the tubes 15.

WVe claim:

1. In'a water tube boiler having superposed banks of inclined tubes spaced apart, an interdeck superheater having inlet and outlet headers in the space between said banks, and a plurality of tubes from the I header to the removable portions exteriorly of the tube bank ends so that the tubes can be expanded in the inlet header by passing "an expander through the parts of-the tubes which enter the header.

2. In a water tube boiler having superposed banks of inclined tubes spaced apart, an interdeck' superheater, one end'of said superheater being supported by tubes, tubes of the lower bank vtubes between their ends and the point of their support from the upper tubes.

3. In a water tube steam boiler, uptake and downtake headers, a bank of horizontally inclined steam generating tubes connecting the headers across'a gas pass, a-superheater beneath said bank of tubes, a superheater inlet header disposed beneath said bank of tubes, a steam and waterdrum, walls directing heating gases into contact with the superheater and generating tubes, a row of substantially straight superheater inlet tubes terminating at the superheater inlet header and terminating at their other ends at positions forwardly of the downtake headers to thereby ermit the header ends of the inlet tubes to be expanded into position by working from a position outside .the boiler'wall and passin the expander through the tubes,-a row 0 steam oiftake tubes leading from the steam and water drum downwardly'to positions forwardly of the downtake headers, and a row of independently removable tube sections extending in front of the downtake headers and connectin the su erheater inlet tubes with the steam 0 take tu es, repair and r placement of the boiler tubes being permitted when the removable tube sections are disconnected;

4. In a water tube steam boiler uptake and downtake headers, abank of horizontally inclined steam'generating tubes connecting the headers across a gas pass, a superheater beneath said bank of tubes, a superheater inlet .header dis osed beneath said bank of tubes,

, a steam an water drum, walls directin heating gases into contact with the super eater and-generating tubes, a row of substantially straight superheater inlet tubes terminating at the superheater inlet header and terminating at their otherends at positlons forwardly of the downtake headers to thereby permit the header ends of-the tubes to be expanded into position by working from a position outside the boiler wall and passing the expander .through the tubes, a row of steam oiftake tubes corresponding in number to the inlet tubes and leading from-the steam and water drum downwardly to positions where they are,individually connected with the inlet m 1 5. In a superheater, a baflie having a row of openings formed therein, return bendv superheater tubes having Ioop extensions projecting through the intermediate openmgs of the row, superheater inlet and outlet headers positioned at levels below corresponding end openings of the row, the end openings I and provided with an angled portion extending from the baflle to the inlet header, and

stop member secured to the ends of the loop extensions to lock the superheater in place relative to the baffle, all of said superheater tubes beingremovable as a unit by elevating them so that the angled portions become parallel to the axes of the oblique end openin so 6. In a water tube steam boiler space upper and lower banks of horizontally inclined steam. generating tubes, substantially horizontal-return bend superheater tubes formed into flat coils disposed between sald banks, uptake and downtake headers for the banks of tubes, nipples connecting the uptake headers for the banks, a baiile supporting one end of each superheater 'coil, and lost motion means operatively associating each coil with the battle so as to permit the removal and replacement of that coil between ad acent nipples without disturbing the integrity of the 7 An inter-deck superheater comprising flat coils of horizontally disposed return bend tubes disposed between banks of boiler tubes, a bafliethrough which the tubes extend to support the superheater, superheater headers spaced from the bafll, and a downwardly bent tube length extending from each and tube ofeach coil to one of the headers. 8. In a water tube steam boiler, a lower bank ofhorizontally inclined tubes, an upper bank of horizontally inclined tubes spaced from the lower bank, an interdeck superheater, suspension means for supporting tubes of the lower bank intermediate their ends, and a pier resting upon the latter tubes intermediate their ends for providing acompression sup ort for the superheater.

9. In awater tu steam boiler, a plurality of vertically spaced banks of horizontally in-" cl-ined steam generating tubes, a baflle construction tying the tubes of an upper bank together intermediate. their ends, a superheater disposed between that upper bank and the next lower bank, a compression support resting upon the upper tubes of the lower bank between its ends and maintaining one end of the su heater, and tension means adacent the '0 er end of the superheater tying the upper tubes of the lower bank to the upper bank which has a supporting beam action.

10. In a water tube steam boiler, a plurality of vertically spaced banks of horizontally inclined steam generating tubes, a steam and water drum, :1. superheater between said banks of tubes, downtake header connections at corresponding ends of the banks of tubes, nipples connecting the upper header construction with the lower header construction,

a plurality of inlet tubes extending from the superheater between the nipples to a position exterior of the header constructions for conducting saturated steam to the superheater, a plurality of drum outlet tubes extending from the steam'space of the drum downwardly, and readily removable tube sections extending across the header construction of the upper tube bank to join the inlet and out- .20 let tubes and complete a saturated steam line from the drum to the superheater, the re-- moval of said sections making the header construction accessible for the repair or replacement of generating tubes.

11. In a water tube boiler comprising rows of inclined water tubes, a superheater above the tubes, a pier resting on the top tubes of the rows, tension means embracing, the lat ter tubes to hold the pier in place on the tubes and having projections extending downwardly from the tubes, and reversible heat resisting blocks located back to back in a dual row between a plurality of top horizontal rows of tubes to distribute the pier load to the latter rows, the blocks having sockets receiving the projections to prevent the blocks from sliding along the tubes away from the pier.

12. In combination with rows of inclined and spaced fluid heat exchange tubes, wall elements contacting with the tubes of one of the rows, devices securing said elements to the tubes, duplicate reversible inter-tube fitting bloeks positioned in contact in two rows between two adjacent rows of the tubes, and formations on the blocks coacting with parts of the devices to prevent the blocks from sliding downwardly on the tubes.

13. In a. water tube boiler having rows of inclined water tubes, duplicate reversible blocks adapted when arranged back to back in two rows between two successive tube rows to constitute a wall, elements fixed with reference to some of the tubes, and formations on the blocks coacting with said elements to prevent the blocks from sliding out of position along the tubes.

" HOWARD J. KERR.

WILLIAM A. JONES. 

